Substitute Spaces

src/offer_05.cpp

@@ -0,0 +1,24 @@
+#include "offer_05.hpp"
+
+string Solution::replaceSpace(string s) {
+  int len = s.length();
+  int cnt{0};
+  for (int i{0}; i < len; ++i) {
+    if (s[i] == ' ') {
+      s.push_back(' ');
+      s.push_back(' ');
+      cnt++;
+    }
+  }
+  len = s.length();
+  for (int fast = len - 1, slow = len - 1 - 2 * cnt; fast >= 0; --slow) {
+    if (s[slow] == ' ') {
+      s[fast--] = '0';
+      s[fast--] = '2';
+      s[fast--] = '%';
+    } else {
+      s[fast--] = s[slow];
+    }
+  }
+  return s;
+}